virus, spyware checker off-line

A friend has asked me to look mt his new (second hand) PC since it is full of junk and old programs. Can anybody advise of any good off-line virus/spyware checkers. The PC is not now connected to the Internet but was before my friend obtained it. Any advice appreciated.

Thanks for your replies.I tried the link given by mfletch but the link did not seem to work. I am also confused about how to go about installing an anti-virus checker on my pen drive. I tried installing AVGfree8.0 but it came back that it could only be installed on a local drive. Any advice appreciated.

you do know that you can use normal AV offline don't you?? just install any AV and do a scan simple, if u don't whant to connect to net just buy a copy of pca it prity much allways has av on it. oh and by the way when formating ur hard drive with a normal formating tool u can still recover the "formated" work easly since there are now loads of programs that do that sort of thing.